Improvement in mode of transmitting and arresting motion



PATENT FFICE.

qWILLIAM SELLERS, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN MODE 0F TRANSMITTING AND ARRESTING MOTION.

Specification forming part of Letters Patent N0. 311,217, dated Januaryil, 1852.

To all 'whom it may concern:

Be it known that I, WILLIAM SELLERS, of the city of Philadelphia andState of Pennsylvania, have invented anew and Improved Device forTransmitting and Arresting Motion; and I do hereby declare the followingto be a full and exact description of the same, reference being had tothe accompanying drawing, and to the figures and letters of referencemarked thereon.

The nature of my invent-ion consists in a peculiar method oftransmitting rotary motion from one shaft to another by means ofaratchetwheel and pawl, the latter being attached to the driven shaft,and so arranged that, while retained in gear with the ratchet-wheel ofthe driver, the latter will, through this pawl, communicate its motionto the second shaft, which now continues to be driven until, by theinterposition of a suitable stop, the pawl is thrown out of gear. Thedriven shaft, being thereby disconnected, now remains idle until uponthe removal of the stop the pawl is again thrown into gear with theratchet-wheel, which thus reimparts motion to the second shaft.

In eases where the driver has a continuous rotary motion in onedirection the throwing into gear of the pawl may be accomplished eitherby a spring pressing the same against the teeth of the ratchet-wheel, orthe same end may be effected by means of a friction-pad attached to thepawl, and so arranged in relation to the driver that the motion of thelatter shall throw the pawl into gear. Vhen, however, this improveddevice is applied to machinery revolving alternately in oppositedirections, and where the second shaft requires to be alternately movedand disengaged in either direction, (as is the case in the applicationof the device represented in the accompanying drawing, and hereinafterfully described,) then a double pawl is employed, and so arranged as tobe actuated in either direction by the motion of the driver through afriction-pad, as above mentioned, a spring acting only in one directionbeing in this case inapplicable.

Another importaint feature of my invention consists in the applicationof a system of adjustable stops in connection with this device in suchcases where the second or driven shaft requires to move only during avariable portion of a revolution in either direction. The

amount of this movement being limited between two stops, it may bevaried at pleasure by altering the relative position of 'the latter, forwhich purpose these stops are made adjustable around the axis of motion.

In order that my said invention may be fully understood, I will nowproceed more particularly to describe the same.

0n reference to the drawing forming a part of this specification, and inwhich the same letters of reference allude to similar part-s throughoutthe several views Figure 1 is a front elevation of my approved devicefor transmitting and arresting motion as applied to feed-motions forplaning-machines. Fig. 2 is a sectional side view of the same. Fig. 3 isa plan, and Fig. 4 a detached, view of the pawl.

A is an internal ratchet-wheel, provided with a long sleeve-journal, B,which has its bearing in a stand, O, and to which is secured opposite toA a spur-wheel, D. To the end of a shaft, E, passing through the sleeveB is attached, in front of the ratchet-wheel A, a circular plate, F.This plate carries the double pawl G, which has its fulcrum on a pin, a,projecting from ablock, H, the latter being iitted to a correspondingrecess in the plate F, to which it is further secured bythe rivets b b.The friction-pad c is attached to a iiat arm, d, of pawl G, and consistsin a piece 0f leather Vriveted or otherwise secured to the arm d on theside next to the face of the ratchet-wheel A,

with which it is held in contact by the pressure of a spiral spring, h,confined in a pocket in the block II. j At the end next to theratchetwheel A the stand G is formed into a circular plate containing anannular V-shaped groove, i', which serves to secure the adjustable stopsI and I in any required position around the periphery of theratchet-wheel A and plate F.

In the annexed drawing the ratchet-wheel A is represented as receiving arotary motion through the spur-wheel D from a pinion, II, and crank L.This motion is supposed to be alternately in one direction and then inthe other, and transmitted to and arrested in the shaft E, the operationof the device being, to this end, as follows:

On reference to Fig. l it will be seen that the pawl is represented asresting with its arm d against the stop I, and in such a position inregard to the internal ratchet-wheel A as to be out of gear with theteeth of the latter. Assuming now the ratchet-wheel to be rotated in thedirection of the arrow, Fig. 1, it will be evident that the frictionproduced by this motion upon the pad c of the pawl G will change theposition of the latter by drawing it around on its fulcrum in thedirection indicated by a second arrow, Fig. 1, thus throwing the pawlinto gear with the first approaching tooth of the ratchet-wheel, andthereby transmitting the motion of the latter to the shaft E and plateF, to which the pawl is attached.

In this manner the shaft E continues to be driven until the pawl G,approaching the stop I in the manner shown in Fig. 1, is again shiftedto its former position, and thrown out of gear by coming in contact withthe said stop I', and immediately after the motion of shaft E ispositively arrested by the block H coming in contact with the stop I',the ratchetwheel A being free to continue its rotary motion. As soon,however, as the motion of the wheel A is reversed the friction of A uponthe pad c throws the pawl G into gear, and the shaft E is moved in theopposite direction until arrested by the stop I, in the manner beforedescribed.

It will be seen that the extent of vibration of the shaft E can bevaried to any desired portion of a revolution by adjusting the stops Iand I' accordingly.

When it is required to transmit rotary 1no tion by means of this device,it will be understood that the stop or stops for arresting that motionmust be so arranged as to have a Inovement at right angles to the axisof the shaft, so that a withdrawal of the same in an outward directionfrom the center of the shaft shall permit a continuous rotary motion ofthe driven shaft of any desired duration, while an inward movement ofthe stop shall bring it in position to throw the pawl out of gear andarrest the motion transmitted through the same, inthe manner 'beforedescribed.

Having thus explained the nature of' my inA vention and the manner inwhich the same may be used, I wish it to be understood that I do notdesire to confine myself to any minute details of the parts constitutingmy improved device; but

What I claim, and desire to secure by Letters Patent, is-

1. The described device for transmitting and arresting rotary orvibrating motion, consistin g of a ratchet-wheel and pawl, when theratchet-wheel is the driver, combined with a stop or stops, the wholeoperating substantially in the manner set forth.

2. The employment of a friction-pad or its equivalent in connection witha ratchet-wheel, pawl, and stop or stops, operating substantially in themanner and for the purpose specified. f

3. Combining with the described device for transmitting and arrestingmotion adjustable stops, for the purpose of varying the motiontransmitted to any desired portion of a revoiution, as herein set forth.

WM. SELLERS.

Witnesses:

Jos. B. HOUGH, OLIVER HOUGH.

